At my church, we charge 65 cents a yard of thread. That way the thread as well as the work is paid for. The quilts run pretty expensive anyway--also depends on the amount of quilting you put into it. You would need to add for the time it takes to assemble the blocks, etc. and the time for making the binding and sewing it on. Nothing is cheap these days. We measure off 36 one yard pieces of thread at a time by wrapping it around a yard stick. Just an idea for you to consider.